title: Chemical curing in alkyd paints: an evaluation via FT-IR and NMR spectroscopies.
abstract: A study aimed at determining the time necessary for an alkyd paint to attain chemical curing is presented. In particular, the object of our investigation was an oil paint made by Winsor & Newton, namely French ultramarine (PB29) in the Griffin Alkyd "fast drying oil colour" series. Using this paint, we prepared several mock-ups on glass. These were left in the laboratory at room temperature in a piece of furniture with glass doors for a total of 70 days. Samples were taken at different times, and the changes in their composition were monitored by means of FT-IR and multinuclear NMR spectroscopic analyses. Since the cross-linking reactions involved in the formation of the pictorial film mainly affect the amount of carbon-carbon double bonds, we monitored the decrease in allyl, diallyl and vinyl protons and carbons. The data obtained from the use of both techniques led us to conclude that, in our particular experimental conditions, the chemical curing of the paint layer is reached within the first 70 days, thus establishing the beginning of the ageing phenomena.
authors.affiliation: "Nello Carrara" Institute of Applied Physics of the National Research Council of Italy (IFAC-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy. Electronic address: g.bartolozzi@ifac.cnr.it.
authors.forename: G
authors.initials: G
authors.lastname: Bartolozzi
authors.forename: V
authors.initials: V
authors.lastname: Marchiafava
authors.forename: V
authors.initials: V
authors.lastname: Mirabello
authors.forename: M
authors.initials: M
authors.lastname: Peruzzini
authors.forename: M
authors.initials: M
authors.lastname: Picollo
mesh_terms: D000538:Aluminum Silicates / Q000032:analysis*; D004396:Coloring Agents / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D010150:Paint / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D000538:Aluminum Silicates; D004396:Coloring Agents; C009620:ultramarine (pigment)
keywords: (1)H NMR; (13)C NMR; Artists’ alkyd paints; Chemical curing; FT-IR